Temperature control for heaters



April 10, 1934. w 5 REICH 1,954,365

TEMPERATURE CONTROL FOR HEATERS Filed March 14, 1931 2 Sheets-Sheet lInvcnlor April 10, 1934. w. s. REICH 1,954,365

TEMPERATURE CONTROL FOR HEATERS Filed March 14, 1931 2 Sheets-Sheet 2 f9f6 7 i 44 I ,14 4! %/!i a Patented Apr. 10, 1934 UNITED STATES PATENTOFFICE 4 Claims.

This invention relates generally to temperature controls for heaters,and particularly to a control of this type operated by room temperature,and adapted to operate one or a plurality of associated devices forincreasing or decreasing the heat generated by a heater or heaters.

It is the object of this invention to provide an extraordinarilyefiicient and positive reacting device of the character described whichwill be durable and not affected by vibration and other factors whichordinarily disturb devices of this type and prevent their functioningaccurately.

It is also an object of this invention to provide a device of thecharacter described which is compact and convenient to install, andwhich is low in cost of manufacture.

These and other objects of the invention, its nature, and itscomposition and arrangement and combination of parts will be readilyunderstood by anyone acquainted with the art to which this inventionrelates upon consulting the following descriptions of the drawings inwhich:

Figure 1 is a front elevational view of my device installed upon a wallor the like.

Figure 2 is a front elevational view of my device with the thermometerand easing of Figure 1 removed therefrom.

Figure 3 is an enlarged detailed view of the lower portion of Figure 2.

Figure 4 is a vertical transverse cross sectional view takenapproximately on the line 4-4 of Figure 2.

Figure 5 is an enlarged detailed view of the lower portion of Figure 2.

Figure 6 is a horizontal sectional view taken approximately on the line6-6 of Figure 4.

Figure 7 is a horizontal sectional view taken approximately on the line7'7 of Figure 2, and

Figure 8 is a diagrammatic view of the wiring system of the device of myinvention.

Referring in detail to the drawings, the numeral 5 designates generallya support such as a wall and the numeral 6 generally designates a casingof vertically elongated type on the front of which may be disposed athermometer '7. Projecting through the upper end of the casing 6 is ahandle 8 for adjusting the thermostat in the casing to be described.

The handle 8 is part of a screw which projects into the casing 6 and iscarried by a bracket 10 secured to the back of the casing. The lower endof the screw has a point 9 which engages the upper side of a dielectricarm 11 which is connected at one end with an adjusting screw 12 of aspiral thermostat 13 of the metallic type the inner convolution of whichis attached to the adjusting screw 12 and to the bracket 14 which ismounted to the back of the casing. The dielectric arm 11 is normallyretained against the lower end of the screw 12 by a spring 15 which hasone end attached to the outer end of the arm 11 and the other endattached to a bracket 16 on the back of the casing. The free end of thespiral thermostat 13 is provided offset as indicated at 1'7, and oneither side of the outer end of the offset 1'7 are contact points 18.The offset portion is normally disposed between and in spaced relationto a fixed contact point 19 and adjustable contact 20. The numerals 21and 22 generally designate vertically disposed magnet coils equippedwith soft iron cores and exterior protective casings. The cores projectdownwardly from the casing of the coils 21 and 22 as indicated at 23 and24. One side of the winding of the magnet 21 is attached to one of thecontacts 19, and the other end of the winding is attached to the lefthand one of a pair of spaced contacts 25, 25 disposed on a dielectricblock 26 and secured to the back of the casing. The magnet coil 22 hasone end of the winding thereof connected to the adjustable contact 20 soand its other end connected to the right hand one of the contacts 25.

On a standard 27 placed between and slightly below the coils 21 and 22there is pivotally mounted a contact arm 28 having laterally andinwardly from its upper end an adjustable carbon brush structure 29 forcontacting the contacts 25, the arm 28 being arranged to be swung in amanner to be described. The numeral 30 refers to a pair of laterallyextending similar armatures carried by the arm 28 in the effective fieldof the coils 21 and 22 for swinging the contact arm 28. At the lower endof the contact arm 28 is secured an insulated fiber or other materialhead having a pair of fingers 32 and between which is received aswingable contact member 33 which is pivotally mounted by one end in abracket 34 (see Figure 5) secured to the back of the casing. In Figure 4the back of the casing is designated by the numeral 35. The contactmember 33 depends downwardly and has attached at an intermediate point36 thereof one end of a spring 3'? whose other end is secured to abracket 38 mounted to the back of the casing above the bracket 38. Thespring 3'7 helps to swing the contact member 33 into and hold the samein contact with either of a pair of spaced contacts 39 and 40 of theadjustable type. When the arm 28 is swung, it bears against one side ofthe member 33 with one of its fingers 32 and pushes the contact member33 away from initial position at first against the tension of the spring3'7 which alternately assists the member 33 into engagement with theremaining one of the contacts 39, 40. The initial position of the member33 is in contact with either contact points 39, 40. The spring 37resists the displacement of the contact member from initial position butas soon as the member has passed a certain point the spring will swingit into and hold it in contact with the remaining one of the contacts39, 40. The contact member has its lower end provided with a pair ofopposed con-- tact points 41.

A similar spring arrangement is provided for operating the arm 28 inconjunction with the magnets 21, 22. A spring 42 has its lower end'fastened to a bracket 43 below the contacts 39, 40' and its upper endsecured above the pivotal point of the arm 28 to a pin 45 projectingfrom the arm. Energizing of either of the magnets 21, 22 will swing thearm 28 from an initial position engaged with one of the contacts 25, 25against the tension of the spring 42 to a point past center whereat thespring contracts and pulls the arm toward the side opposite its initialposition and into engagement with the other one of the contacts 25, 25.

A supply line conductor 46 is electrically connected with the metallicthermostat 13 and a s-econdsupply line conductor 4'7 is electricallyconnected withthe carbon brush 29 of the arm 23 for energizing the coilmagnets 21 and 22. A power circuit conductor 48 is electricallyconnected to the swingable contact member 33, and other power conductors49 and 50 are connected to the contacts 39 and 40, the conductors 48, 49and 50 being provided for operating any associated devices such as highvoltage heaters and the like, requiring quick connection anddisconnection according to the action of thermostat.

It is obvious that with the device in operating condition contraction orexpansion of the thermostat will causethe portion 17 thereof to engageone or the other of the contacts 19 and 20, with the consequence ofenergizing the correspondingone of the coils 21 and 22 so as to causeswinging of the arm 28 and operation of the swingable contact member 33so that the member 33 will leave the one of the contacts 39 and 40 withwhich it was initially engaged and contact the remaining one of thecontacts 39, 40, thereby operating either side of a suitably associatedpower circuit of the type described.

It is to be definitely understood that I do not desire to limit theapplication of this invention to the particular modification set outherein to illustrate the principles thereof, and any change or changesmay be made in material, arrangement and combination of parts consistentwith the spirit and'scope of the invention.

Having thus described my invention, what I claim as new is:

1. A switch of the type described comprising a base, a pairofelectro-magnets on the base, a pair of contacts each of which isconnected to one of the terminals of one of said electro-magnets, aswingable'armature beam on the base between and in magnetic relation tosaid electro-magnets, a contact on the beam for selective engagementwith said contacts, and a second pair of contacts on the base, aswingable contact maker for cooperation with either of said secondcontacts, spring means to maintain the contact maker contacted witheither of said second contacts, and a the dielectric block on said beamarranged to engage either side of said swingable contact memher to swingthe swingable contact member, upon swinging of the beam, to engage oneof the second contacts, said swingable beam being over balanced so as tobe normally engaged with one of the first mentioned pair of contacts.

2. A switch of the type described comprising a base, a pair ofelectro-magnets on the base, a pair of contacts each of which isconnected to one of the terminals of one of said electro-magnets, aswingable armature beam on the base between and in magnetic relation tosaid electro-magnets, a contact on the beam for selective engagementwith said contacts, and a second pair of contacts on the base, aswingable contact maker for cooperation with either of said secondcontacts, spring means to maintain the contact maker contacted witheither of said second contacts, and a dielectric block on said beamarranged to engage either side of said swingable contact member to swingthe swingable contact member, upon swinging of the beam, to engage voneof the second contacts, said swingable beam being overbalanced so as tobe normally engaged with one of the first mentioned pair of contacts,said swingable contact maker being arranged to be substantially inlongitudinal alinement with the beam when the beam is at rest.

3. A switch of the type described comprising a base, a pair ofelectro-magnets on the base, a pair of contacts each of which isconnected to one of the terminals of one of said electro-magbetween andin magnetic relation to said electromagnets, a contact on the beam forselective engagement with said contacts, and a second pair of contactson the base, a swingable contact maker for cooperation with either ofsaid second con-" tacts, spring means to maintain the contact makercontacted with either of said second contacts, and a dielectric block onsaid beam arnets, a swingable armature beam on the base ranged to engageeither side of said swingable contact member to swing the swingablecontact member, upon swinging of the beam, to engage one of the secondcontacts, said swingable beam being overbalanced so as to benormallyengaged with one of the first mentioned pair of contacts, saidswingable contact maker being arranged to be substantially inlongitudinal alinement with the beam when the beamis at rest, saiddielectric block comprising arms 10- cated at opposite sides of thecontact maker and spaced therefrom when the beam is at rest, saidcontact maker being arranged to swing in the same direction as thebeamwhen moved thereby.

4. A switch of the type described comprising a base, a pair ofelectro-magnets on the base, a

pair of contacts each of which is connected to one of the terminals ofone of said electro-magnets, a swingable armature beam on the basebetween and in magnetic relation to said electromagnets, a contact onthe beam for selective engagement with said contacts, and a second pairbeing overbalanced so as to be normally engaged direction as the beamwhen moved thereby, said contact maker being pivoted near one end on thebase and said dielectric block being adapted to engage the same betweenits pivotal point and the other end thereof, said other end beingengageable with the second pair of contacts.

WILLIAM S. REICH.

